Specify TaskType of posted Task explicitly in MessagePort (3)

third_party/WebKit/Source/core/dom/MessagePort.cpp

Index: third_party/WebKit/Source/core/dom/MessagePort.cpp
diff --git a/third_party/WebKit/Source/core/dom/MessagePort.cpp b/third_party/WebKit/Source/core/dom/MessagePort.cpp
index fca2b56427bd6fd9cf1479770643a502f63b39b0..655e09e3a11c1f14c056a97c029c6d362a791951 100644
--- a/third_party/WebKit/Source/core/dom/MessagePort.cpp
+++ b/third_party/WebKit/Source/core/dom/MessagePort.cpp
@@ -33,6 +33,7 @@
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/dom/ExecutionContextTask.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/events/MessageEvent.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/workers/WorkerGlobalScope.h"
@@ -126,8 +127,10 @@ WebMessagePortChannelUniquePtr MessagePort::disentangle() {
 // access mutable variables).
 void MessagePort::messageAvailable() {
   DCHECK(getExecutionContext());
+  // TODO(tzik): Use ParentThreadTaskRunners instead of ExecutionContext here to
+  // avoid touching foreign thread GCed object.
   getExecutionContext()->postTask(
-      BLINK_FROM_HERE,
+      TaskType::PostedMessage, BLINK_FROM_HERE,
       createCrossThreadTask(&MessagePort::dispatchMessages,
                             wrapCrossThreadWeakPersistent(this)));
 }